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EP2755579A1 - Surgical tool for reaming the diaphyseal canal of long bones - Google Patents

Surgical tool for reaming the diaphyseal canal of long bones

Info

Publication number
EP2755579A1
EP2755579A1 EP12753998.9A EP12753998A EP2755579A1 EP 2755579 A1 EP2755579 A1 EP 2755579A1 EP 12753998 A EP12753998 A EP 12753998A EP 2755579 A1 EP2755579 A1 EP 2755579A1
Authority
EP
European Patent Office
Prior art keywords
tool
surgical tool
reaming
canal
diaphyseal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12753998.9A
Other languages
German (de)
French (fr)
Other versions
EP2755579B1 (en
Inventor
Yvan Arlettaz
Christian Bonjour
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chirmat Sarl
Original Assignee
Chirmat Sarl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chirmat Sarl filed Critical Chirmat Sarl
Publication of EP2755579A1 publication Critical patent/EP2755579A1/en
Application granted granted Critical
Publication of EP2755579B1 publication Critical patent/EP2755579B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/16—Instruments for performing osteoclasis; Drills or chisels for bones; Trepans
    • A61B17/164—Instruments for performing osteoclasis; Drills or chisels for bones; Trepans intramedullary
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/16—Instruments for performing osteoclasis; Drills or chisels for bones; Trepans
    • A61B17/1613—Component parts
    • A61B17/1615—Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/16—Instruments for performing osteoclasis; Drills or chisels for bones; Trepans
    • A61B17/1613—Component parts
    • A61B17/1631—Special drive shafts, e.g. flexible shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B2017/00526—Methods of manufacturing

Definitions

  • the present invention relates to a boring head for enlargement of the medullary canal in the treatment of fractures of long bones.
  • Intramedullary nailing is one of the most used therapeutic techniques in the treatment of fractures and in the reconstruction of long bones, especially during fracture of the femoral body, but this technique can also be applied to other long bones such as humerus or shin.
  • the intramedullary bore technique consists of enlarging the diaphyseal canal with a boring head, or a series of diameter-increasing boring heads mounted on a shaft
  • the reaming operation is preliminary to the insertion of a metal nail or pin into the diaphyseal canal, in order to reduce and stabilize the fracture and, at the same time, relieve the compressive load on the bone.
  • the intramedullary bore calibrating to the desired diameter of the diaphyseal canal, improves the adaptation and adhesion of the nail to the wall of the medullary canal and considerably reduces the risk of jamming of the nail or bursting of the body of the bone. long when inserting the implant.
  • this technique also has important biological and clinical advantages: it can carry bone particles in the fracture site, with an effect equivalent to an autograft which contributes to the healing process.
  • a guide rod also known as a Kirschner rod
  • the boring head and its drive shaft have an axial hole allowing it to slide concentrically on the guide rod.
  • the guide rods are preferably equipped with an olive or protrusion at the distal end to recover, if necessary, a bored or damaged boring head.
  • An object of the present invention is to provide a boring head free from the limitations of known tools, and in particular a boring head which makes it possible to minimize the effects of overpressure and
  • Another object of the invention is to provide a boring head more economical than known devices, allowing its unique use.
  • a surgical tool for boring the diaphyseal long bone canal comprising: a central core and a peripheral sleeve coaxial with said core central and connected by a plurality of vanes defining a plurality of axial openings connecting an anterior face of the tool with a rear face of the tool, and teeth on the outer surface of said peripheral sleeve.
  • Figures 1a and 1d illustrate a boring head according to an aspect of the invention seen by the front face and respectively by the rear face;
  • Figures 1b and 1c illustrate the boring head of Figures 1a and 1d from side and front view.
  • - Figure 2 illustrates the characteristic angles of the boring head of Figures 1a-1d;
  • Figure 3 illustrates a possible connection system between a reamer according to the invention and a drive shaft.
  • a reamer according to one aspect of the invention comprises a cylindrical or truncated-conical socket 24 carrying helical teeth 26a-26e on its outer surface.
  • the radius r of the boring head 10 is chosen as a function of the dimensions of the bone to be treated and the desired channel diameter.
  • the boring heads are made in series with gradually increasing dimensions, for example with a progression of the radius of 0.2-0.5 mm between two successive elements. This allows the surgeon to perform the boring in several passes, removing a small amount of cortical bone at each pass.
  • the height of the boring head measured along the axis of rotation is chosen in relation to its lateral dimensions, preferably being between 5 and 20 mm depending on the diameter of the boring head.
  • Figure 2 shows the profile of one of the helical teeth 26a-e.
  • the teeth have a large cutting angle, to reduce the cutting force, and also a pronounced cutting angle ⁇ , in order to minimize the friction of the back of the tooth on the machined part.
  • the helix angle of the teeth is preferably between 15 ° and 35 °. Surgical bore heads are generally designed to rotate clockwise, and the helix angle is therefore to the right, so as to extract the cut material towards the rear of the tool.
  • the figures refer to the case of a tool with five teeth, but it is clear that this is not a limiting feature of the invention.
  • the boring head can carry a different number of teeth, for example two, three, or four or even six or more.
  • the boring head has a core 60 coaxial with the sleeve 24 with a central hole 62 for the passage of the Kirschner rod.
  • the axial hole 62 of the front face has a round section (Fig. 1a) whose diameter corresponds to that of the Kirschner rod, while at the rear face the boring head For example, it has an axial hole 65 of polygonal section (Fig. 1 d) to allow the transmission of the motor torque from a shaft
  • the core 60 and the bushing 24 are rigidly secured by radial fins 41a-41e which leave open a large part of the surface between the core 60 and the sleeve 24.
  • the reamer has five fins and four axial openings 45a-45e, but this is not a necessary feature of the invention, the fins and openings being any number.
  • the effect of the axial openings 45a-e is to allow the passage of the bone marrow from the front to the back of the tool as it advances into the diaphyseal canal, thus relieving the overpressure in the canal and reducing the risk of fat embolism or bursting.
  • the diaphyseal canal can be likened to a cylinder of constant diameter with a porous distal end filled with a liquid of high viscosity, incompressible for practical effects, and the boring head by a disk which is pushed in from the proximal end.
  • the flow of the inner material is determined by the equations of continuity and conservation of the mass.
  • Three cases are interesting: if the disk is full and the clearance between the disk and the wall is very small, the pressure will increase sharply in the cylinder; a part of the viscous liquid will exit through the porous end and another through the clearance between the head and the wall: the overpressure favors the passage of a portion of the fluid in the bloodstream, and therefore the risk of fat embolism is increased.
  • the pressure will increase, but will not be sufficient to cause percolation of the viscous liquid through the porous end, the displacement of the piston will be difficult and will cause a
  • the disc is perforated and presents axial openings putting in communication the anterior face with the face
  • the structure of the boring head of the invention allows the passage of the bone marrow through the openings 45a-45e, thus ensuring easier advancement and reducing pressure within the diaphyseal canal.
  • the boring head of the invention simplifies the surgical procedure and reduces the likelihood of embolism or other adverse outcomes.
  • the fins 41 ae are not contained in axial planes, but are curved or inclined so as to to promote the extraction of the marrow towards the rear face by the rotation of the tool without compressing it, in the manner of an auger.
  • the inclined or curved arrangement also increases the rigidity of the tool relative to a structure with planar fins.
  • the front face of the boring head is not flat but has a convergent section 53, for example curved or truncated-conical profile, facilitating the centering of the tool in the diaphyseal channel.
  • the rear face preferably also has a converging section 54, for example curved or truncated-conical profile, with the aim of reducing the friction of the tool.
  • the tool of the invention is preferably made of surgical steel or any other suitable material, and preferably intended for a single use, (but not exclusively), in this way the surgeon has, for each boring operation, a perfectly sharpened tool, which reduces
  • the central core 60 has a small diameter, so as to maximize the section of the openings.
  • the core 60 will have a diameter less than 7.0 mm, more preferably equal to or less than 5.0 mm; the diameter of the core is related to the diameter of the boring head.
  • the drive shaft and the support for securing the boring head with the shaft preferably also have limited diameters so as not to impede the flow of the spinal cord. Supports with a diameter of less than 9.0 mm, preferably less than 8.0 mm, will be used; the diameter of the drive shaft is related to the long bored bone.
  • the present invention can be used with several forms of drive shafts and carriers.
  • the preferably single-use boring head of the invention would preferably be coupled with a disposable composite drive shaft, for example the devices described in International Patent Application WO201 1051260 in the name of the Applicant and represented in FIG. Figure 3.
  • the drive shaft 100 is entirely traversed axially by an axial channel 1 18 intended to allow the passage of the Kirschner rod. At one end, it has an interface element 1 for coupling with a mandrel of a motor, for example a hexagonal prismatic element, or any other suitable interface element.
  • the shaft 120 of the drive shaft is preferably a flexible rod made of a composite material comprising carbon and / or glass fibers enclosed in an elastomer-containing resin matrix. This embodiment makes it possible to propose driving shafts with characteristics of elasticity and optimum strength at a very high cost.
  • boring head of the invention can be used in combination with any type of transmission shaft: it could for example be coupled with conventional metallic transmission shafts, or with transmission shafts. composite with different characteristics, without departing from the scope of the invention.
  • connection between the shaft 100 and the boring heads is obtained, in this embodiment, by a connecting element 135 comprising a tenon 140 with a polygonal cross-section which matches the shape of the axial hole 65 of the rear face of the head. bore. Stability in the axial direction is ensured, for example, by the elastic ring 1 50 which engages in a corresponding groove (not visible in the figures) of the boring head.
  • the invention however is not limited to the coupling system described above and shown in the figures, but also includes tenons of any shape, for example dovetail, keys, screw couplings, or any other suitable coupling system.

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  • Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Medical Informatics (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Dentistry (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)

Abstract

The invention relates to a surgical tool (10) for reaming the diaphyseal canal of long bones, in particular of the femur, humerus, or tibia, in order to insert a intramedullary rod. The modular reaming head includes: a central core (60) and a peripheral bushing (24) that is coaxial to said central core (60) and connected via a plurality of vanes (41a-41e) defining a plurality of axial openings (45a-45e) connecting a front surface (12) of the tool (10) to a rear surface (11) of the tool (10), and teeth (26a-26e) on the outer surface of said peripheral bushing (24). The openings allow material to pass toward the rear when the tool advances within the diaphyseal canal, minimizing pressure and friction, resulting in a positive effect on the rate of clinical complications. The tool is preferably made using the metal injection molding (MIM) technique in order to reduce production costs and enable the one-time use thereof. The reaming head of the invention can be perfectly combined with composite or metal drive shafts.

Description

Outil chirurgical pour l'alésage du canal diaphysaire d'os longs  Surgical tool for boring the diaphyseal canal of long bones
Domaine technique Technical area
La présente invention concerne une tête d'alésage pour l'élargissement du canal médullaire dans le traitement des fractures des os longs. The present invention relates to a boring head for enlargement of the medullary canal in the treatment of fractures of long bones.
Etat de la technique State of the art
L'enclouage centromédullaire est une des techniques thérapeutiques les plus utilisées dans le traitement des fractures et dans la reconstruction des os longs, notamment lors de fracture du corps du fémur, mais cette technique peut être appliquée aussi à d'autres os longs tels que l'humérus ou le tibia. La technique de l'alésage centromédullaire consiste en l'élargissement du canal diaphysaire avec une tête d'alésage, ou une série de têtes d'alésage de diamètre croissant, montée sur un arbre Intramedullary nailing is one of the most used therapeutic techniques in the treatment of fractures and in the reconstruction of long bones, especially during fracture of the femoral body, but this technique can also be applied to other long bones such as humerus or shin. The intramedullary bore technique consists of enlarging the diaphyseal canal with a boring head, or a series of diameter-increasing boring heads mounted on a shaft
d'entraînement souple. L'opération d'alésage est préliminaire à l'insertion d'un clou ou broche métallique dans le canal diaphysaire, afin de réduire et stabiliser la fracture et, en même temps, soulager la charge de compression sur l'os. L'alésage centromédullaire, réalisant un calibrage au diamètre souhaité du canal diaphysaire, améliore l'adaptation et l'adhésion du clou à la paroi du canal médullaire et réduit considérablement le risque de coincement du clou ou d'éclatement du corps de l'os long lors de l'insertion de l'implant. flexible training. The reaming operation is preliminary to the insertion of a metal nail or pin into the diaphyseal canal, in order to reduce and stabilize the fracture and, at the same time, relieve the compressive load on the bone. The intramedullary bore, calibrating to the desired diameter of the diaphyseal canal, improves the adaptation and adhesion of the nail to the wall of the medullary canal and considerably reduces the risk of jamming of the nail or bursting of the body of the bone. long when inserting the implant.
En plus des avantages mécaniques suscités, Cette technique présente aussi des importants avantages sur le plan biologique et clinique : notamment elle peut transporter des particules osseuses dans le site de la fracture, avec un effet équivalent à une autogreffe ce qui participe au processus de guérison. Pour assurer que l'alésage soit parfaitement concentrique au canal médullaire, on insère préalablement une tige de guidage (aussi connue sous le nom de tige de Kirschner) jusqu'à la métaphyse distale par rapport à fracture. La tête d'alésage et son arbre d'entraînement ont un trou axial lui permettant de glisser concentriquement sur la tige de guidage. Les tiges de guidage sont préférablement équipées d'une olive ou une protubérance à l'extrémité distale pour récupérer, si nécessaire, une tête d'alésage bloquée ou endommagé. In addition to the mechanical advantages, this technique also has important biological and clinical advantages: it can carry bone particles in the fracture site, with an effect equivalent to an autograft which contributes to the healing process. To ensure that the bore is perfectly concentric with the medullary canal, a guide rod (also known as a Kirschner rod) is inserted before the distal metaphysis with respect to fracture. The boring head and its drive shaft have an axial hole allowing it to slide concentrically on the guide rod. The guide rods are preferably equipped with an olive or protrusion at the distal end to recover, if necessary, a bored or damaged boring head.
Cette technique est conseillée de par ses indéniables avantages cliniques. Elle comporte également certains défauts liés notamment aux pressions et aux échauffements qui se produisent à l'intérieur du canal médullaire lors de l'alésage et qui pourraient provoquer des embolies graisseuses. Une technique chirurgicale appropriée comportant des vitesses de coupe et d'avancement modérées et limitant l'épaisseur enlevée à 0.2 à 0.5 mm (au rayon) par passage, permettent de réduire ces risques, sans toutefois les éliminer complètement. This technique is recommended because of its undeniable clinical advantages. It also has certain defects related in particular to the pressures and overheating that occur inside the medullary canal during reaming and which could cause greasy embolisms. Proper surgical technique with moderate cutting and advancing speeds and limiting the thickness removed to 0.2 to 0.5 mm (radius) per pass, can reduce these risks, but not eliminate them completely.
On connaît des outils spécifiques pour l'alésage du canal médullaire, par exemple les alésoirs décrits par les documents EP0648477, EP2335617, EP1987785. Le document US2004236339 décrit un dispositif de guidage pour l'alésage centromédullaire, tandis que US2006064164 divulgue des fraises orthopédiques utilisées préalablement à la pose d'un implant lors d'une fracture du col du fémur. Ces dispositifs sont toutefois coûteux et doivent être réutilisés. Ils sont cependant difficiles à nettoyer et à stériliser, particulièrement en milieu hospitalier. Leur usage est délicat en raison des surpressions qu'ils engendrent dans l'os lors de l'opération, et de Specific tools are known for the boring of the medullary canal, for example the reamers described by the documents EP0648477, EP2335617, EP1987785. US2004236339 describes a guide device for the intramedullary bore, while US2006064164 discloses orthopedic cutters used prior to the placement of an implant during a fracture of the femoral neck. These devices are however expensive and must be reused. However, they are difficult to clean and sterilize, especially in hospitals. Their use is delicate because of the overpressures they generate in the bone during the operation, and
réchauffement par friction qu'ils provoquent, particulièrement si leurs tranchants ne sont pas parfaitement affûtés. Bref résumé de l'invention frictional warming they cause, especially if their edges are not perfectly sharpened. Brief summary of the invention
Un but de la présente invention est de proposer une tête d'alésage exempte des limitations des outils connus, et notamment une tête d'alésage qui permet de minimiser les effets de surpression et An object of the present invention is to provide a boring head free from the limitations of known tools, and in particular a boring head which makes it possible to minimize the effects of overpressure and
d'échauffement lors de l'élargissement du canal médullaire. Un autre but de l'invention est de proposer une tête d'alésage plus économique que les dispositifs connus, autorisant son usage unique. of heating during the widening of the medullary canal. Another object of the invention is to provide a boring head more economical than known devices, allowing its unique use.
Selon l'invention, ces buts sont atteints notamment au moyen de l'objet des revendications annexées, et notamment par un outil chirurgical pour l'alésage du canal diaphysaire d'os longs comprenant : une âme centrale et une douille périphérique coaxiale avec ladite âme centrale et connectée par une pluralité d'ailettes définissant une pluralité d'ouvertures axiales reliant une face antérieure de l'outil avec une face postérieure de l'outil, et des dents sur la surface extérieure de ladite douille périphérique. According to the invention, these objects are attained in particular by means of the object of the appended claims, and in particular by a surgical tool for boring the diaphyseal long bone canal comprising: a central core and a peripheral sleeve coaxial with said core central and connected by a plurality of vanes defining a plurality of axial openings connecting an anterior face of the tool with a rear face of the tool, and teeth on the outer surface of said peripheral sleeve.
Brève description des figures Brief description of the figures
Des exemples de mise en œuvre de l'invention sont indiqués dans la description illustrée par les figures annexées dans lesquelles : Examples of implementation of the invention are indicated in the description illustrated by the appended figures in which:
Les figures 1 a et 1 d illustrent une tête d'alésage selon un aspect de l'invention vu par la face avant et, respectivement, par la face arrière; Figures 1a and 1d illustrate a boring head according to an aspect of the invention seen by the front face and respectively by the rear face;
Les figures 1 b et 1 c illustrent la tête d'alésage des figures 1 a et 1 d vue de côté et de face. - La Figure 2 illustre les angles caractéristiques de la tête d'alésage des figures 1 a-1 d ; La Figure 3 illustre un possible système de connexion entre un alésoir selon l'invention et un arbre d'entraînement. Figures 1b and 1c illustrate the boring head of Figures 1a and 1d from side and front view. - Figure 2 illustrates the characteristic angles of the boring head of Figures 1a-1d; Figure 3 illustrates a possible connection system between a reamer according to the invention and a drive shaft.
Exemple(s) de mode de réalisation de l'invention Example (s) of embodiment of the invention
Avec référence aux figures de 1 a à 1 d, un alésoir selon un aspect de l'invention comporte une douille cylindrique ou tronc-conique 24 portant des dents hélicoïdales 26a-26e sur sa surface extérieure. Le rayon r de la tête d'alésage 10 est choisi en fonction des dimensions de l'os à traiter et du diamètre de canal que l'on souhaite obtenir. Préférablement, les têtes d'alésage sont réalisés en série avec des dimensions progressivement croissantes, par exemple avec une progression du rayon de 0,2-0,5 mm entre deux éléments successifs. Cela permet au chirurgien d'effectuer l'alésage en plusieurs passages, enlevant une modique quantité d'os cortical à chaque passage. Dans le cas d'une fracture du corps du fémur on préconise, d'une manière générale, de porter le canal médullaire à un diamètre final entre 1 1 et 14 mm avant d'insérer le clou, mais plusieurs facteurs peuvent influencer ces dimensions, la dimension du patient, la nature de la fracture et le type de clou entre autres. With reference to FIGS. 1a to 1d, a reamer according to one aspect of the invention comprises a cylindrical or truncated-conical socket 24 carrying helical teeth 26a-26e on its outer surface. The radius r of the boring head 10 is chosen as a function of the dimensions of the bone to be treated and the desired channel diameter. Preferably, the boring heads are made in series with gradually increasing dimensions, for example with a progression of the radius of 0.2-0.5 mm between two successive elements. This allows the surgeon to perform the boring in several passes, removing a small amount of cortical bone at each pass. In the case of a fracture of the femur body it is generally recommended to bring the medullary canal to a final diameter between 11 and 14 mm before inserting the nail, but several factors can influence these dimensions, the size of the patient, the nature of the fracture and the type of nail, among others.
La hauteur de la tête d'alésage mesurée selon l'axe de rotation est choisie en relation avec ses dimensions latérales, étant préférablement comprise entre 5 et 20 mm en fonction du diamètre de la tête d'alésage. La figure 2 montre le profil d'une des dents hélicoïdales 26a-e . The height of the boring head measured along the axis of rotation is chosen in relation to its lateral dimensions, preferably being between 5 and 20 mm depending on the diameter of the boring head. Figure 2 shows the profile of one of the helical teeth 26a-e.
Préférablement, les dents ont un angle de coupe a important, pour réduire la force de taille, et aussi un angle de dépouille δ prononcé, afin de minimiser le frottement de l'arrière de la dent sur la partie usinée. L'angle de taillant β, déterminé par la relation α+β+δ=90°, est par conséquent modéré, mais pas au point d'affaiblir la dent. Des essais ont permis de conclure que des angles compris entrel 5 et 40 °, typiquement entre 20 et 30° pour a et entre 3 et 20°, typiquement entre 7 et 1 5° pour δ offrent une performance optimale. L'angle d'hélice des dents est préférablement compris entre 1 5° et 35°. Les têtes d'alésage chirurgicales sont généralement conçues pour tourner en sens horaire, et l'angle d'hélice est par conséquent à droite, de manière à extraire le matériau coupé vers l'arrière de l'outil. Preferably, the teeth have a large cutting angle, to reduce the cutting force, and also a pronounced cutting angle δ, in order to minimize the friction of the back of the tooth on the machined part. The angle of cut β, determined by the relation α + β + δ = 90 °, is therefore moderate, but not so weak as to weaken the tooth. Tests have concluded that angles between 5 and 40 °, typically between 20 and 30 ° for a and between 3 and 20 °, typically between 7 and 15 ° for δ provide optimal performance. The helix angle of the teeth is preferably between 15 ° and 35 °. Surgical bore heads are generally designed to rotate clockwise, and the helix angle is therefore to the right, so as to extract the cut material towards the rear of the tool.
Les figures se réfèrent au cas d'un outil à cinq dents, mais on voit bien que cela n'est pas une caractéristique limitative de l'invention. La tête d'alésage peut porter un nombre de dents différent, par exemple deux, trois, ou quatre, voire six ou plus. The figures refer to the case of a tool with five teeth, but it is clear that this is not a limiting feature of the invention. The boring head can carry a different number of teeth, for example two, three, or four or even six or more.
Revenant maintenant à la figure 1 , la tête d'alésage présente une âme 60 coaxiale avec la douille 24 avec un trou central 62 pour le passage de la tige de Kirschner. Dans ce mode de réalisation, le trou axial 62 de la face avant a une section ronde (Fig. 1 a) dont le diamètre correspond à celui de la tige de Kirschner, tandis qu'au niveau de la face arrière la tête d'alésage présente par exemple un trou axial 65 de section polygonale (Fig. 1 d) pour permettre la transmission du couple moteur depuis un arbre Returning now to Figure 1, the boring head has a core 60 coaxial with the sleeve 24 with a central hole 62 for the passage of the Kirschner rod. In this embodiment, the axial hole 62 of the front face has a round section (Fig. 1a) whose diameter corresponds to that of the Kirschner rod, while at the rear face the boring head For example, it has an axial hole 65 of polygonal section (Fig. 1 d) to allow the transmission of the motor torque from a shaft
d'entraînement, comme on le verra plus bas. D'autres formes seraient également possibles dans le cadre de l'invention. of training, as will be seen below. Other forms would also be possible within the scope of the invention.
L'âme 60 et la douille 24 sont solidarisées rigidement par des ailettes radiales 41 a-41 e qui laissent ouverte une grande partie de la surface entre l'âme 60 et la douille 24. Dans les dessins, l'alésoir présente cinq ailettes et quatre ouvertures axiales 45a-45e, mais cela n'est pas une caractéristique nécessaire de l'invention, les ailettes et ouvertures pouvant être en un nombre quelconque. The core 60 and the bushing 24 are rigidly secured by radial fins 41a-41e which leave open a large part of the surface between the core 60 and the sleeve 24. In the drawings, the reamer has five fins and four axial openings 45a-45e, but this is not a necessary feature of the invention, the fins and openings being any number.
L'effet des ouvertures axiales 45a-e est de permettre le passage de la moelle osseuse de l'avant à l'arrière de l'outil lorsque celui-ci avance dans le canal diaphysaire, allégeant ainsi la surpression dans le canal et réduisant le risque d'embolie graisseuse ou d'éclatement. The effect of the axial openings 45a-e is to allow the passage of the bone marrow from the front to the back of the tool as it advances into the diaphyseal canal, thus relieving the overpressure in the canal and reducing the risk of fat embolism or bursting.
On peut assimiler le canal diaphysaire à un cylindre de diamètre constant avec une extrémité distale poreuse rempli d'un liquide de viscosité élevé, incompressible aux effets pratiques, et la tête d'alésage par un disque qui est poussé vers l'intérieur depuis l'extrémité proximale. L'écoulement du matériau interne est déterminé par les équations de continuité et de conservation de la masse. Trois cas sont intéressants: si le disque est plein et le jeu entre le disque et la paroi est très faible, la pression va fortement augmenter dans le cylindre; une partie du liquide visqueux sortira par l'extrémité poreuse et une autre par le jeu entre la tête et la paroi : la surpression favorise le passage d'une partie du fluide dans la circulation sanguine, et par conséquent le risque d'embolie graisseuse est accru. - si le disque est plein et le jeu entre le disque et la paroi est important, la pression va augmenter, mais ne sera pas suffisante pour provoquer une percolation du liquide visqueux à travers l'extrémité poreuse, le déplacement du piston sera difficile et provoquera un The diaphyseal canal can be likened to a cylinder of constant diameter with a porous distal end filled with a liquid of high viscosity, incompressible for practical effects, and the boring head by a disk which is pushed in from the proximal end. The flow of the inner material is determined by the equations of continuity and conservation of the mass. Three cases are interesting: if the disk is full and the clearance between the disk and the wall is very small, the pressure will increase sharply in the cylinder; a part of the viscous liquid will exit through the porous end and another through the clearance between the head and the wall: the overpressure favors the passage of a portion of the fluid in the bloodstream, and therefore the risk of fat embolism is increased. - If the disk is full and the clearance between the disk and the wall is important, the pressure will increase, but will not be sufficient to cause percolation of the viscous liquid through the porous end, the displacement of the piston will be difficult and will cause a
échauffement par frottement du liquide (rapport des vitesses dans le rapport des surfaces) si en revanche le disque est ajouré et présente des ouvertures axiales mettant en communication la face antérieure avec la face heating by friction of the liquid (ratio of the velocities in the ratio of the surfaces) if on the other hand the disc is perforated and presents axial openings putting in communication the anterior face with the face
postérieure, et l'issue vers sa face arrière est dégagée, la pression posterior, and the exit towards its rear face is released, the pressure
n'augmentera quasiment pas, il n'y aura n'y percolation à l'extrémité poreuse, ni augmentation de la température car la majorité du liquide visqueux s'échappera par le centre du disque. will hardly increase, there will be no percolation at the porous end, nor increase in temperature because the majority of the viscous liquid will escape through the center of the disc.
On voit donc comment la structure de la tête d'alésage de l'invention permet le passage de la moelle osseuse par les ouvertures 45a-45e, assurant ainsi un avancement plus facile et réduisant la pression à l'intérieur du canal diaphysaire. De cette manière, la tête d'alésage de l'invention simplifie l'acte chirurgical et réduit la probabilité d'embolie ou autres issues défavorables. It is thus seen how the structure of the boring head of the invention allows the passage of the bone marrow through the openings 45a-45e, thus ensuring easier advancement and reducing pressure within the diaphyseal canal. In this way, the boring head of the invention simplifies the surgical procedure and reduces the likelihood of embolism or other adverse outcomes.
Selon une variante préférée de l'invention, les ailettes 41 a-e ne sont pas contenues dans des plans axiaux, mais sont courbées ou inclinées de façon à favoriser l'extraction de la moelle vers la face arrière par la rotation de l'outil sans la comprimer, à la manière d'une vis tarière. La disposition inclinée ou courbée augmente également la rigidité de l'outil par rapport à une structure avec des ailettes planes. Dans un mode de réalisation préféré, la face avant de la tête d'alésage n'est pas plane mais comporte une section convergente 53, par exemple de profil bombé ou tronc-conique, facilitant le centrage de l'outil dans le canal diaphysaire. La face arrière comporte préférablement elle aussi une section convergente 54, par exemple de profil bombé ou tronc-conique, avec le but de réduire le frottement de l'outil. According to a preferred variant of the invention, the fins 41 ae are not contained in axial planes, but are curved or inclined so as to to promote the extraction of the marrow towards the rear face by the rotation of the tool without compressing it, in the manner of an auger. The inclined or curved arrangement also increases the rigidity of the tool relative to a structure with planar fins. In a preferred embodiment, the front face of the boring head is not flat but has a convergent section 53, for example curved or truncated-conical profile, facilitating the centering of the tool in the diaphyseal channel. The rear face preferably also has a converging section 54, for example curved or truncated-conical profile, with the aim of reducing the friction of the tool.
L'outil de l'invention est préférablement réalisé en acier chirurgical ou tout autre matériel idoine, et destiné préférablement à un usage unique, (mais pas exclusivement), de cette façon le chirurgien dispose, pour chaque opération d'alésage, d'un outil parfaitement affûté, ce qui réduit The tool of the invention is preferably made of surgical steel or any other suitable material, and preferably intended for a single use, (but not exclusively), in this way the surgeon has, for each boring operation, a perfectly sharpened tool, which reduces
considérablement les efforts de coupe, le frottement et réchauffement. Préférablement, il est réalisé avec la technique MIM (Métal Injection considerably cutting efforts, friction and warming. Preferably, it is realized with the technique MIM (Metal Injection
Molding, ou Moulage à Injection de Métal) afin de réduire son prix de revient. Molding, or Metal Injection Molding) to reduce its cost price.
Préférablement, l'âme centrale 60 a un faible diamètre, de façon à maximiser la section des ouvertures. Préférablement l'âme 60 aura un diamètre inférieur à 7,0 mm, plus préférablement égal ou inférieur à 5,0 mm; le diamètre de l'âme est en relation avec le diamètre de la tête d'alésage. L'arbre d'entraînement et le support destiné à solidariser la tête d'alésage avec l'arbre ont préférablement eux aussi des diamètres limités, afin de ne pas entraver l'écoulement de la moelle. On utilisera des supports avec un diamètre inférieur à 9,0 mm, préférablement inférieur à 8,0 mm; le diamètre de l'arbre d'entraînement est en relation avec l'os long alésé. La présente invention peut être utilisée avec plusieurs formes d'arbres d'entraînement et supports. La tête d'alésage préférentiellement à usage unique de l'invention serait préférablement accouplé avec un arbre d'entraînement à usage unique en composite, comme par exemple les dispositifs décrits dans la demande de brevet International WO201 1051260 au nom de la demanderesse et représentés dans la figure 3. Preferably, the central core 60 has a small diameter, so as to maximize the section of the openings. Preferably the core 60 will have a diameter less than 7.0 mm, more preferably equal to or less than 5.0 mm; the diameter of the core is related to the diameter of the boring head. The drive shaft and the support for securing the boring head with the shaft preferably also have limited diameters so as not to impede the flow of the spinal cord. Supports with a diameter of less than 9.0 mm, preferably less than 8.0 mm, will be used; the diameter of the drive shaft is related to the long bored bone. The present invention can be used with several forms of drive shafts and carriers. The preferably single-use boring head of the invention would preferably be coupled with a disposable composite drive shaft, for example the devices described in International Patent Application WO201 1051260 in the name of the Applicant and represented in FIG. Figure 3.
L'arbre d'entraînement 100 est entièrement traversé axialement par un canal axial 1 18 destiné à permettre le passage de la tige de Kirschner. A une extrémité, il présente un élément d'interface 1 10 pour l'accouplement avec un mandrin d'un moteur, par exemple un élément prismatique hexagonal, ou tout autre élément d'interface idoine. Le fût 120 de l'arbre d'entraînement est préférablement une tige souple réalisée avec un matériau composite comprenant des fibres de carbone et/ou de verre englobées en une matrice de résine contenant un élastomère. Cette forme de réalisation permet de proposer des arbres d'entraînement avec des caractéristiques d'élasticité et résistance optimales à un coût très The drive shaft 100 is entirely traversed axially by an axial channel 1 18 intended to allow the passage of the Kirschner rod. At one end, it has an interface element 1 for coupling with a mandrel of a motor, for example a hexagonal prismatic element, or any other suitable interface element. The shaft 120 of the drive shaft is preferably a flexible rod made of a composite material comprising carbon and / or glass fibers enclosed in an elastomer-containing resin matrix. This embodiment makes it possible to propose driving shafts with characteristics of elasticity and optimum strength at a very high cost.
avantageux. La tête d'alésage de l'invention, toutefois, est utilisable en combinaison avec n'importe quel type d'arbre de transmission : on pourrait par exemple l'accoupler avec des arbres de transmission métalliques classiques, ou avec des arbres de transmission en composite avec des caractéristiques différentes, sans sortir du cadre de l'invention. advantageous. The boring head of the invention, however, can be used in combination with any type of transmission shaft: it could for example be coupled with conventional metallic transmission shafts, or with transmission shafts. composite with different characteristics, without departing from the scope of the invention.
La connexion entre l'arbre 100 et les têtes d'alésage est obtenue, dans ce mode de réalisation, par un élément de connexion 135 comportant un tenon 140 à section polygonale qui épouse la forme du trou axial 65 de la face arrière de la tête d'alésage. La stabilité en direction axiale est assurée, par exemple, par l'anneau élastique 1 50 qui s'engage en une gorge correspondante (non visible dans les figures) de la tête d'alésage. The connection between the shaft 100 and the boring heads is obtained, in this embodiment, by a connecting element 135 comprising a tenon 140 with a polygonal cross-section which matches the shape of the axial hole 65 of the rear face of the head. bore. Stability in the axial direction is ensured, for example, by the elastic ring 1 50 which engages in a corresponding groove (not visible in the figures) of the boring head.
Cette disposition permet un échange facile des têtes d'alésage et une excellente transmission du couple moteur tout en restant très compacte. L'invention toutefois n'est pas limitée au système de couplage décrit ci- dessus et représenté dans les figures, mais englobe également des tenons de n'importe quelle forme, par exemple en queue d'aronde, des clavettes, des couplages à vis, ou tout autre système de couplage approprié. This arrangement allows easy exchange of the boring heads and excellent transmission of engine torque while remaining very compact. The invention however is not limited to the coupling system described above and shown in the figures, but also includes tenons of any shape, for example dovetail, keys, screw couplings, or any other suitable coupling system.
On peut ainsi proposer un assortiment complet de têtes d'alésage et un arbre de transmission sous forme de kit à usage unique, éliminant ainsi tous les problèmes de nettoyage et stérilisation des outils connus et offrant toujours des outils affûtés et parfaitement performants. It is thus possible to offer a complete assortment of boring heads and a transmission shaft in the form of a single-use kit, thus eliminating all the cleaning and sterilization problems of known tools and still offering sharp tools and perfectly performing.
Numéros de référence employés sur les figures a angle de coupe Reference numbers used in cut-angle figures
β angle de taillant β cutting angle
δ angle de dépouille δ draft angle
10 tête d'alésage  10 bore head
1 1 face arrière  1 1 back side
12 face avant  12 front
24 douille  24 socket
26a-e dents  26th teeth
41 a-e ailettes  41 a-e fins
45a-e ouvertures axiales  45a-e axial openings
53 section convergente face avant 53 front converging section
54 section convergente face arrière54 convergent section back side
60 âme 60 soul
62 trou axial face avant  62 axial hole front face
65 trou axial face arrière  65 axial hole on the back
100 arbre d'entraînement  100 drive shaft
1 10 interface moteur  1 10 engine interface
1 18 canal axial  1 18 axial channel
120 tige souple  120 flexible rod
135 élément de connexion  135 connection element
140 tenon à section polygonale  140 tenon with polygonal section
1 50 anneau élastique  1 50 elastic ring

Claims

Revendications claims
1 . Outil chirurgical (10) pour l'alésage du canal diaphysaire d'os longs, comprenant : une âme centrale (60) et une douille périphérique (24) coaxiale avec ladite âme centrale (60) et connectée par une pluralité d'ailettes (41 a-41 e) définissant une pluralité d'ouvertures axiales (45a-45d) reliant une face antérieure (12) de l'outil (10) avec une face postérieure (1 1 ) de l'outil (10), et des dents (26a-26e) sur la surface extérieure de ladite douille périphérique (24). 1. A surgical tool (10) for boring the diaphyseal long bone canal, comprising: a central core (60) and a peripheral sleeve (24) coaxial with said central core (60) and connected by a plurality of vanes (41); a-41 e) defining a plurality of axial openings (45a-45d) connecting an anterior face (12) of the tool (10) with a posterior face (1 1) of the tool (10), and teeth (26a-26e) on the outer surface of said peripheral sleeve (24).
2. Outil chirurgical (10) selon l'une des revendications précédentes, dans lequel lesdites ailettes (41 a-41 e) présentent des surfaces courbes ou inclinées. 2. Surgical tool (10) according to one of the preceding claims, wherein said fins (41 a-41 e) have curved or inclined surfaces.
3. Outil chirurgical (10) selon l'une des revendications précédentes, dans lequel ladite âme (60) comporte un trou axial (62). 3. Surgical tool (10) according to one of the preceding claims, wherein said core (60) has an axial hole (62).
4. Outil chirurgical (10) selon l'une des revendications précédentes, dans lequel lesdites dents ont une disposition hélicoïdale. 4. Surgical tool (10) according to one of the preceding claims, wherein said teeth have a helical disposition.
5. Outil chirurgical (10) selon l'une des revendications précédentes, dans lequel ladite douille a une forme essentiellement cylindrique ou tronc- conique. 5. Surgical tool (10) according to one of the preceding claims, wherein said sleeve has a substantially cylindrical or truncated conical shape.
6. Combinaison d'au moins un outil chirurgical (10) selon l'une des revendications précédentes, et d'un arbre de transmission (100) 6. Combination of at least one surgical tool (10) according to one of the preceding claims, and of a transmission shaft (100)
comprenant une tige souple (120) en composite avec des fibres de carbone et/ou de verre englobés en une matrice polymérique comprenant un élastomère. comprising a flexible rod (120) made of composite with carbon fibers and / or glass embedded in a polymeric matrix comprising an elastomer.
7. Utilisation de la technique de Moulage à Injection de Métal pour la réalisation de l'outil chirurgical de l'une des revendications de 1 à 6. 7. Use of the Metal Injection Molding Technique for producing the surgical tool of one of claims 1 to 6.
EP12753998.9A 2011-09-16 2012-09-04 Surgical tool for drilling a bore in the diaphyseal cavity of long bones Not-in-force EP2755579B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH01536/11A CH705550A1 (en) 2011-09-16 2011-09-16 Surgical tool for boring the diaphyseal canal of long bones.
PCT/EP2012/067240 WO2013037673A1 (en) 2011-09-16 2012-09-04 Surgical tool for reaming the diaphyseal canal of long bones

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EP2755579A1 true EP2755579A1 (en) 2014-07-23
EP2755579B1 EP2755579B1 (en) 2016-04-06

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CH705550A1 (en) 2013-03-28
EP2755579B1 (en) 2016-04-06
US20140236156A1 (en) 2014-08-21
WO2013037673A1 (en) 2013-03-21

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